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人工湿地填料磷去除效果的影响因素分析

Keywords: 湿地,填料,磷去除,水力负荷

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Abstract:

为分析人工湿地填料磷去除效果的影响因素,选取页岩、粗砾石、铁矿石、麦饭石等不同填料进行等温磷吸附实验和室内小试磷去除研究。结果表明,填料类型和粒径影响填料磷吸附性能。上述填料磷吸附性能依次为页岩>铁矿石>麦饭石>粗砾石且页岩最大磷吸附量随粒径增加而减小。水力负荷(HLA)变化对不同填料磷去除效率影响效果不同,当HLA从200mm·d-1降至142.8mm·d-1时,粗砾石构建湿地总磷去除率增加大约10%;麦饭石因为吸附渐进饱和总磷去除率呈现出不断下降趋势;铁矿石可能受微生物影响导致Fe等金属元素释放,总磷去除率从大约6%(HLA=200mm·d-1)上升至35%(HLA=142.8mm·d-1)左右;页岩受HLA变化影响较小,总磷去除率基本稳定在80%以上。综合上述实验结果发现填料种类、粒径及水力负荷均影响湿地填料磷去除效果。

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